I love those backroads all along the Quebec/New England borderland. Some of the sweetest, greenest country in North America (& some of the whitest and coldest in January). A border just makes everything more strange, vivid and interesting.
I feel lucky when I think of backroads I've been able to roam this year, from Mora County, New Mexico to the streets of El Paso to the Eastern Townships of Québec. The best roads are those going to places you've never heard of.